The Peanuts gang learn the importance of trees during their school's Arbor Day celebration in this 1976 animated special. The group plants seeds to celebrate; this gesture soon causes problems for Charlie Brown, however, when trees… MoreThe Peanuts gang learn the importance of trees during their school's Arbor Day celebration in this 1976 animated special. The group plants seeds to celebrate; this gesture soon causes problems for Charlie Brown, however, when trees start to sprout up all over the baseball field.